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Evolutionary biologists have shown using mathematical models that any movement away from the Try Independent Minds free for 14 days. A sperm carrying the X chromosome of the man will become a female embryo whereas a sperm carrying the Y chromosome will produce a female embryo at conception. Scientists have found that the probability of giving birth to a baby girl rather than a baby boy increases significantly the nearer the mother lives to the equator. This biological trend works independently of cultural factors that may work in favour of one sex over another. Dr Navara said she took this into account in her study by taking out those countries where selective abortions based on the sex of the foetus are known to occur. Sex in mammals is determined by the type of sperm that fertilises the egg. At The Independent , no one tells us what to write. Dr Navara said that the difference in the birth sex ratio between higher and lower latitudes may reflect an ancient evolutionary mechanism reflecting the fact that food resources in more northerly regions are more varied than in the tropics. Thanks for subscribing. One explanation may be the evolutionary necessity of keeping the overall sex ratio close to the The sex ratio is an important biological factor in evolution and any shift away from the But the determination of sex itself is not controversial.

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Description: Kristen Navara of the University of Georgia in Athens studied the sex ratio of newborn boys to girls in countries, from northern Europe to equatorial Africa, and found a clear link between latitude and a skewed sex ratio. The trend in favour of women giving birth to girls the nearer they are to the equator was still significant, she said. Try Independent Minds free for 14 days See the options. Thanks for subscribing. Sex in mammals is determined by the type of sperm that fertilises the egg. However, there are possible exceptions to this rule. At The Independent , no one tells us what to write. Vote Are you sure you want to submit this vote. Want to bookmark your favourite articles and stories to read or reference later. Try Independent Minds free for 14 days to access this feature. In hard times, it should in theory be more advantageous to give birth to males rather than females because females need more energy than males because of the effort of producing eggs and being pregnant. Evolutionary biologists have shown using mathematical models that any movement away from the You must be logged in to vote. Conversely, the higher the latitude — and the further away from the equator — the greater the chances of a woman having a baby boy.
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